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Wang Lei 4a2d789267 DNS: If the DNS server returns an error, allow that to be cached [ver #2] 
If the DNS server returns an error, allow that to be cached in the DNS resolver
key in lieu of a value.  Userspace passes the desired error number as an option
in the payload:

	"#dnserror=<number>"

Userspace must map h_errno from the name resolution routines to an appropriate
Linux error before passing it up.  Something like the following mapping is
recommended:

	[HOST_NOT_FOUND]	= ENODATA,
	[TRY_AGAIN]		= EAGAIN,
	[NO_RECOVERY]		= ECONNREFUSED,
	[NO_DATA]		= ENODATA,

in lieu of Linux errors specifically for representing name service errors.  The
filesystem must map these errors appropropriately before passing them to
userspace.  AFS is made to map ENODATA and EAGAIN to EDESTADDRREQ for the
return to userspace; ECONNREFUSED is allowed to stand as is.

The error can be seen in /proc/keys as a negative number after the description
of the key.  Compare, for example, the following key entries:

2f97238c I--Q--     1  53s 3f010000     0     0 dns_resol afsdb:grand.centrall.org: -61
338bfbbe I--Q--     1  59m 3f010000     0     0 dns_resol afsdb:grand.central.org: 37

If the error option is supplied in the payload, the main part of the payload is
discarded.  The key should have an expiry time set by userspace.

Signed-off-by: Wang Lei <wang840925@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
2010-08-11 17:11:28 +00:00
..
9p v9fs: fixup for inode_setattr being removed 2010-08-11 00:08:00 -04:00
adfs check ATTR_SIZE contraints in inode_change_ok 2010-08-09 16:47:39 -04:00
affs AFFS: wait for sb synchronization when needed 2010-08-09 16:48:51 -04:00
afs DNS: If the DNS server returns an error, allow that to be cached [ver #2] 2010-08-11 17:11:28 +00:00
autofs autofs/autofs4: Move compat_ioctl handling into fs 2010-08-09 00:13:34 +02:00
autofs4 autofs4: remove unneeded null check in try_to_fill_dentry() 2010-08-11 08:59:06 -07:00
befs fix typos concerning "initiali[zs]e" 2010-06-16 18:05:05 +02:00
bfs BFS: clean up the superblock usage 2010-08-09 16:48:53 -04:00
btrfs Merge branch 'for-2.6.36' of git://git.kernel.dk/linux-2.6-block 2010-08-10 15:22:42 -07:00
cachefiles vfs: add helpers to get root and pwd 2010-08-11 00:28:20 -04:00
ceph ceph: generalize mon requests, add pool op support 2010-08-10 14:41:25 -07:00
cifs cifs: update README to include details about 'fsc' option 2010-08-11 17:11:28 +00:00
coda Merge branch 'for-2.6.36' of git://git.kernel.dk/linux-2.6-block 2010-08-10 15:22:42 -07:00
configfs fix setattr error handling in sysfs, configfs 2010-06-04 17:16:29 -04:00
cramfs simplify get_cramfs_inode() 2010-08-09 16:47:51 -04:00
debugfs
devpts
dlm fs/dlm: Drop unnecessary null test 2010-08-05 14:23:45 -05:00
ecryptfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ecryptfs/ecryptfs-2.6 2010-08-10 12:14:39 -07:00
efs
exofs Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd 2010-08-11 09:19:43 -07:00
exportfs
ext2 mbcache: Remove unused features 2010-08-09 16:48:45 -04:00
ext3 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
ext4 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
fat covert fatfs to ->evict_inode() 2010-08-09 16:48:01 -04:00
freevxfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
fscache fscache: fix build on !CONFIG_SYSCTL 2010-07-24 11:10:09 +02:00
fuse Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
gfs2 Merge branch 'for-2.6.36' of git://git.kernel.dk/linux-2.6-block 2010-08-10 15:22:42 -07:00
hfs convert remaining ->clear_inode() to ->evict_inode() 2010-08-09 16:48:37 -04:00
hfsplus convert remaining ->clear_inode() to ->evict_inode() 2010-08-09 16:48:37 -04:00
hostfs try to get rid of races in hostfs open() 2010-08-09 16:48:15 -04:00
hpfs switch hpfs to ->evict_inode() 2010-08-09 16:48:17 -04:00
hppfs switch hppfs to ->evict_inode() 2010-08-09 16:48:16 -04:00
hugetlbfs new helper: end_writeback() 2010-08-09 16:47:49 -04:00
isofs isofs: Fix lseek() to position beyond 4 GB 2010-08-11 00:29:47 -04:00
jbd ext3: Fix set but unused variables 2010-07-21 16:01:47 +02:00
jbd2 Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 2010-08-07 13:03:53 -07:00
jffs2 Merge git://git.infradead.org/mtd-2.6 2010-08-10 11:49:21 -07:00
jfs jfs: don't allow os2 xattr namespace overlap with others 2010-08-10 15:33:09 -07:00
lockd
logfs Make ->drop_inode() just return whether inode needs to be dropped 2010-08-09 16:48:35 -04:00
minix switch minix to ->evict_inode(), fix write_inode/delete_inode race 2010-08-09 16:47:53 -04:00
ncpfs Merge branch 'bkl/ioctl' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing 2010-08-10 13:58:28 -07:00
nfs NFS: Use kernel DNS resolver [ver #2] 2010-08-11 17:11:28 +00:00
nfs_common
nfsd Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify 2010-08-10 11:39:13 -07:00
nilfs2 Merge branch 'for-2.6.36' of git://git.kernel.dk/linux-2.6-block 2010-08-10 15:22:42 -07:00
nls
notify Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify 2010-08-10 11:39:13 -07:00
ntfs convert remaining ->clear_inode() to ->evict_inode() 2010-08-09 16:48:37 -04:00
ocfs2 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
omfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bcopeland/omfs 2010-08-10 11:47:36 -07:00
openpromfs
partitions partitions: fix sometimes unreadable partition strings 2010-08-11 08:59:20 -07:00
proc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-11 09:23:32 -07:00
qnx4 get rid of cont_write_begin_newtrunc 2010-08-09 16:47:31 -04:00
quota Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
ramfs check ATTR_SIZE contraints in inode_change_ok 2010-08-09 16:47:39 -04:00
reiserfs reiserfs: remove unused local `wait' 2010-08-11 08:59:12 -07:00
romfs
smbfs switch smbfs to evict_inode() 2010-08-09 16:48:00 -04:00
squashfs Squashfs: fix checkpatch.pl warnings 2010-08-08 22:29:33 +00:00
sysfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
sysv fs/sysv/super.c: add support for non-PDP11 v7 filesystems 2010-08-11 08:59:23 -07:00
ubifs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
udf Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
ufs switch ufs to ->evict_inode() 2010-08-09 16:48:02 -04:00
xfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-08-10 11:26:52 -07:00
aio.c aio: fix wrong subsystem comments 2010-08-05 13:21:23 -07:00
anon_inodes.c Revert "anon_inode: set S_IFREG on the anon_inode" 2010-05-27 22:03:05 -04:00
attr.c check ATTR_SIZE contraints in inode_change_ok 2010-08-09 16:47:39 -04:00
bad_inode.c drop unused dentry argument to ->fsync 2010-05-27 22:05:02 -04:00
binfmt_aout.c
binfmt_elf.c
binfmt_elf_fdpic.c binfmt_elf_fdpic: Fix clear_user() error handling 2010-06-01 08:11:06 -07:00
binfmt_em86.c
binfmt_flat.c flat: tweak default stack alignment 2010-06-29 15:29:31 -07:00
binfmt_misc.c convert remaining ->clear_inode() to ->evict_inode() 2010-08-09 16:48:37 -04:00
binfmt_script.c
binfmt_som.c
bio-integrity.c
bio.c block: unify flags for struct bio and struct request 2010-08-07 18:20:39 +02:00
block_dev.c blkdev: cgroup whitelist permission fix 2010-08-11 08:59:18 -07:00
buffer.c get rid of block_write_begin_newtrunc 2010-08-09 16:47:33 -04:00
char_dev.c Fix init ordering of /dev/console vs callers of modprobe 2010-08-06 09:17:02 -07:00
compat.c Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify 2010-08-10 11:39:13 -07:00
compat_binfmt_elf.c
compat_ioctl.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6 2010-08-10 15:03:42 -07:00
dcache.c vfs: show unreachable paths in getcwd and proc 2010-08-11 00:29:47 -04:00
dcookies.c
direct-io.c sort out blockdev_direct_IO variants 2010-08-09 16:47:29 -04:00
drop_caches.c simplify checks for I_CLEAR/I_FREEING 2010-08-09 16:47:44 -04:00
eventfd.c
eventpoll.c
exec.c Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify 2010-08-10 11:39:13 -07:00
fcntl.c vfs: O_* bit numbers uniqueness check 2010-08-11 08:59:02 -07:00
fifo.c
file.c vfs: use kmalloc() to allocate fdmem if possible 2010-08-11 08:59:02 -07:00
file_table.c vfs: improve comment describing fget_light() 2010-08-11 08:59:02 -07:00
filesystems.c
fs-writeback.c Merge branch 'for-2.6.36' of git://git.kernel.dk/linux-2.6-block 2010-08-10 15:22:42 -07:00
fs_struct.c vfs: add helpers to get root and pwd 2010-08-11 00:28:20 -04:00
generic_acl.c
inode.c Merge branch 'for-linus' of git://git.infradead.org/users/eparis/notify 2010-08-10 11:39:13 -07:00
internal.h
ioctl.c
ioprio.c
Kconfig fs/Kconfig: Fix typo Userpace -> Userspace 2010-07-20 17:30:22 +02:00
Kconfig.binfmt
libfs.c check ATTR_SIZE contraints in inode_change_ok 2010-08-09 16:47:39 -04:00
locks.c
Makefile
mbcache.c mbcache: fix shrinker function return value 2010-08-09 16:48:47 -04:00
mpage.c
namei.c vfs: add helpers to get root and pwd 2010-08-11 00:28:20 -04:00
namespace.c vfs: remove unused MNT_STRICTATIME 2010-08-11 00:29:47 -04:00
nfsctl.c
no-block.c
open.c vfs: clarify that nonseekable_open() will never fail 2010-08-11 08:59:02 -07:00
pipe.c pipe: fix check in "set size" fcntl 2010-06-10 19:08:34 +02:00
pnode.c
pnode.h
posix_acl.c
read_write.c fsnotify: pass a file instead of an inode to open, read, and write 2010-07-28 09:58:32 -04:00
read_write.h
readdir.c vfs: fix warning: 'dirent' is used uninitialized in this function 2010-08-09 20:45:05 -07:00
select.c
seq_file.c
signalfd.c signalfd: fill in ssi_int for posix timers and message queues 2010-08-11 08:59:20 -07:00
splice.c splice: fix misuse of SPLICE_F_NONBLOCK 2010-08-07 18:52:56 +02:00
stack.c
stat.c
statfs.c add f_flags to struct statfs(64) 2010-08-09 16:48:44 -04:00
super.c no need for list_for_each_entry_safe()/resetting with superblock list 2010-08-09 16:49:02 -04:00
sync.c get rid of file_fsync() 2010-08-09 16:47:43 -04:00
timerfd.c
utimes.c
xattr.c
xattr_acl.c